85010238721 has 2 divisors, whose sum is σ = 85010238722. Its totient is φ = 85010238720.

The previous prime is 85010238713. The next prime is 85010238727. The reversal of 85010238721 is 12783201058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57329598096 + 27680640625 = 239436^2 + 166375^2 .

It is a cyclic number.

It is not a de Polignac number, because 85010238721 - 2³ = 85010238713 is a prime.

It is not a weakly prime, because it can be changed into another prime (85010238727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42505119360 + 42505119361.

It is an arithmetic number, because the mean of its divisors is an integer number (42505119361).

Almost surely, 2^85010238721 is an apocalyptic number.

It is an amenable number.

85010238721 is a deficient number, since it is larger than the sum of its proper divisors (1).

85010238721 is an equidigital number, since it uses as much as digits as its factorization.

85010238721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 37.

Adding to 85010238721 its reverse (12783201058), we get a palindrome (97793439779).

The spelling of 85010238721 in words is "eighty-five billion, ten million, two hundred thirty-eight thousand, seven hundred twenty-one".